While you wait for answers, we may have found some information which could help you.
Click here for Petrol Grass Trimmerwhere do I get 18v battery for Challenge Strimmer DCSRT18?
Blade guard?
what is the sparkplug gap setting?
Replacement Spool Cover Challenge Extreme Grass Trimmer Product?
How to fix Challenge Extreme Grass Trimmer 350W Product number SRT 350B?
where can i purchase a spool & line complete ?